Mechanical movement.



1Y0-723,255. PATENTED MAR. 24, 1903. E. L. & H. J. EBERHARDT. MECHANICAL MOVEMENT. APYLIOATION PILEDfJUNE 14, 1902, No MODEL. 2 sHBETs-sHEBT v2'.

UNITED p STATES ri-TENT EEICE.

FRED L. EBERHARDT AND HENRY J.

EBERHARDT, GF NEWARK, NEVT .IER-

" sEY, AssiGNORs To GOULD a EBERHARDT, OE NEWARK, NEW JERSEY,

A CORPORATION OE NEW JERSEY.

MECHANICAL IVIOVEM ENT.

SPECIFIGATIN formingA part of Letters Patent No. 723,255, dated March 24, 1903.

"Application iiled June 14, 1962.

To @ZZ whom it Magnan/cern:

Be it known that we, FRED L. EBERHARDT, v

`1o and the accompanying drawings, forming a part .of the same. p

This invention relates to that class ofispeedgearing in which a gear movable upon a rotary shaft is connected by an adjustable arm i5 and intermediate gear with any one of a series of graded gears upon an adjacent parallel shaft; and the Object of the invention is to furnish a greater range of speeds` than heretofore with a given number of gearzo wheels and to simplify 'the shifting and locking mechanism for the intermediate or transmitting wheels. t p In the present invention two gear-wheels `of different sizes are fitted movably upon a p a 5 splined rotary shaftin connection with` a single adjusting-arm projected at one side only of said shaft and having two independent or individualintermediates which mesh, respectively, into such gears with-their outer ends 3o set nearly coincident, and the usual means is provided for holding the arm in various positions to adjust either of the intermediates so as to mesh with any of the series of graded gears. One of the movable gears upon the rotary shaft is made considerably larger than the other, and the intermediatesare correspondingly Varied in size and are pivoted upon the arm so that their'outer edges are approximately even or` flush with` one another 4o to t closely when required against the edge of a very small'graded gear. One of the intermediates transmits Va materially higher rate of speed than the other and may be called the fhigh-speed intermediate, while the p A `other may be called the low-speed intery mediate,

Y 'p Either the rotary shaft carrying the movable gears or the shaft carrying the series of graded gears may be used as the driver, and

`5o in such case a uniform speed of either shaft Serial No. 111.652. A(No model.)

imparts the desired selective speed to the other shaft.

For convenience in describing the invention the shaft carrying the movable gearswill be termed the rotary shaft and the shaft carrying the graded gears will be termed the driven shaft. `The latteris shown in the drawings attached tO a screw, as would be the case if employed to feed the carriage of a lathe or milling-machine; but the particular application of the variable speed is entirely immaterial tothis invention.

In the annexed drawings, Figure l is a front View `of a box or casing containing the speed-gearing. Fig. 2 is a plan of the same with the top removed to show the arrangement of the gearing. Fig. 3 is a section on line 3 3 in Fig. 2, and Fig. 4 is a section of the adjusting-arm upon a plane through the axes of the gear-wheels. Fig. 4 is drawn upon a larger scale than the othergures.

A casing o is shown, having bearings for the splinedA rotary shaft h and for the driven shaft c, connected at one end with a feed-screw d. A` graded series of spuit-gears e is shown secured upon `the shaft c to rotate therewith. Two gear-Wheelsfand g are shown fitted with a key s to the splined` shaft h, whichhas a key-seat extended between its bearings to fit the key. AThe forks h h of an adjusting-arm embrace the shaft at .opposite sides of such gear-wheels. The gearf is shown twice the size of' the gear g ,and separate intermediate spur-wheels f and g are pivoted, respectively, upon the forks 7 1y and h of the adjusting-arm to mesh with the gears j' and g, and the intermediates are so proportioned that their outer edges are substantially coincident, as shown in Fig. 3. The swinging of the adjusting-arm upon the splined shaft permits the adjustment of either of the intermediates into contact with the 'edge of one of the graded gears e,` and spaces e are formed between such graded gears upon -the shaft o to clear the other intermediate when either is engaged with one of thegraded gears.

By making the outeredges of the intermediate gears coincident they may be not only fitted more readily to the various gears c, but

much smaller graded gears may be used in the series than where one intermediate projects beyond the edge of the other. To make the outer edges of the intermediates coincident when the intermediates are of such diverse sizes, they are mounted upon separate studs 7c and 7c', fastened in the arms h and h. Such studs are eccentric to one another, and to form a rigid construction a rivet t is eX- tended through them both, which holds them firmly in their longitudinal positions.

The cover of the casing is formed with an arched 'guide a', having a slot formed by a seriesof notches adapted to guide a hand-lever projected from the adjusting-arm. The base h2 of the forks which form the adj listing-arm is provided with a leverj, carrying a socket L, through which a spring-bolt fm is inserted, and provided at its outer end with a handpiece n. The series of notches o in the guide a are so located longitudinally of the shaft b and so extended above or below the line of the shaft that theyguide the lever of the shifting arm into the Various positions required to set each of the intermediates in turn in contact with the graded gears.

Six graded gears are shown upon the shaft c, and two of the notches 0 are shown in the guide a to set the adjusting-arm in two positions relative to each of such graded gears. The high-speed intermediate and the lowspeed intermediate may thus both be separately engaged with each of the graded gears, and twelve Variations of speed may be obtained by the use of the six graded gears, and any of such speed variations may be instantly secured by manipulating a single lever,which sets the adjusting-arm in the required position. The raising of the hand piece n throws theinner end of the adjusting-arm downward and enables the intermediates to engage the `larger gears e.

In Figs. 1, 2, and 3 the handpiece is shown in its lowest position in a notch adaptedv to hold the intermediates entirely clear from the graded gears, so that the rotation of one shaft imparts Ano movement to the other; but the adjusting-arm may be shifted laterally upon the shaft b by raising the handpiece and moving it to any of the notches. Such raising of the handpiece n is indicated by dotted lines in Fig. 3, with a corresponding depression of the adjusting-arm to bring the intermediate g adjacent to one of the graded gears. The intersection of its periphery with such graded gear is indicated by the dotted circles in Fig.

3, and the proximity of the other intermediate f is indicated by the smaller dotted circle adjacent thereto.

The centers of the gears f' and g are so located that their peripheries coincide at their extreme outer edges, as at such point they extend farthest from the shaft b, and are thus best adapted to mesh with the smallest gears upon the shaft c. The coincidence of the two gears at such point enables either of them to mesh with a gear having teeth close to the shaft, as neither projects beyond the other,V

a greater variation of speed than could be secured if one intermediate projected beyond the other.

As stated above, it is immaterial which of the shafts b or c is employed as the driver; but the reversal of such driving arrangement also inverts'the relation of the intermediate and its connected gear for g, and thus produces a reversal in the effect of the intermediate. The intermediate which operates to transmit the high speed when the shaft b is the dri ver therefore transmits the lower speed when the shaft c becomes the driver.

The gear-w-heels c in the graded series are shown with hubs for attachment to the shaft c and have been described as thus attached; but the invention does not require the attachment of these gears to the shaft, as any means of transmitting the movement from such graded gears to a rotative part would perform all the functions of the invention. It is therefore immaterial whether the graded gears be connected together by attachment to a rotatable shaft or by attachment to a sleeve rotatable upon a fixed spindle, as the essential part of the invention is the connection of the graded gears together, so that the motion of any of them may be transmitted to 'a common object. It is therefore immaterial whether the movement of the graded gears be transmitted to the desired part by the shaft c or by any other suitable means.

The speed-gearing described may be used for a great variety of purposes, and therefore constitutes a species of mechanical Inovement.

The screw d, which is connected with the shaft c, merely illustrates one application of the mechanism, in which it operates to transmit a selective speed to a feed-screw from a uniform rotating driving-shaft b; but this mechanical movement can be used to vary the speed of a cutting or drilling spindle or of any rotary part which requires an adjustable or variable speed. j

We are aware that a double-armed tumbler has been used to support at its opposite ends intermediates connected with gears of diverse sizes movable upon a rotary shaft; but in our invention a tumbler with one arm only is used, and the intermediates are placed side by side at the same side of the rotary shaft, and where a very small gear is used at one end of the cone of graded gears the intermediates are mounted eccentrically side by side, so that their outer edges are flush with one another. By this construction either of the intermediates may be engaged with a gear very little larger than the shaft which carries the graded gears.

IOO

Mrotary splined shaft h and the adjacent graded series of gears e, gears of diverse sizes fitted side by side movably upon the splined shaft, an adj usting-arm fitted to the splined shaft to slide such gears longitudinally thereon, and` having twointermediates pivoted upon the same end of the arm side by side and meshing respectively with such gears, and all of such intermediates adapted to mesh with any of the graded gears by a suitable adjustment of the arm.

. such intermediates adapted to mesh with any `of 'the graded gears by a suitable adjustment of the arm. t j

3. A mechanical movement comprising the `rotary splined shaft and the adjacent graded l series of gears, two gears of diverse sizes fitted movably upon the splined shaft, an adj usting-arm movable upon the shaft, two inten mediates meshing with such gears and pivoted upon the same end of the arm, side by side eccentrically to one another with their outer edges substantially coincident, and either of such intermediates adapted to mesh with any of the graded gears bya suitable adjustment of the arm.

` 4. A mechanical movement comprising the rotary splined shaft and the adjacent driven shaft having thereon a graded series of gears, one of such gears being projected slightly from the surface of such shaft, two gears of diverse sizes tted movablynpon the splined shaft, an adj usting-arm with fork pivoted on said shaft at the sides of the two gears, a 1ever to set such adjusting-arm, and a casing with notches fitted to the lever as set forth, two intermediates meshing with such gears and pivoted upon the same end of the arm, side by side, eccentrically to one another upon the said forks, with their outer edges substantially coincident, Vto prevent interference of the shaft with either intermediate when each in turn ,is meshed with the gear projected slightly from the driven shaft.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

FRED L. EBERHARDT'. HENRY J. ERERHARDE.

Witnesses:

Jos. B. PIERsoN, THOMAS S. CRANE. 

